<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>背景色</title>
</head>
<body>
<div style="width:200px; height:50px; 
background-color:#ff0000;"></div>
<div style="width:200px; height:50px;
background-color:#00ff00;"></div>
<div style="width:200px; height:50px;
background-color:#0000ff;"></div>
</body>
</html>
